Diaphragm pump



Feb.'28, 1939. A, G MORRIS ET AL 2,148,957

DIAPHRAGM PUMP Filed June 28, 195'! 4 sheets-sheet 1 Feb,.28-, 1939. A.e.` MORRIS ET AL DIAPHRAGM PUMP 4 Sheet-Sheet 2 Filed June 28, 193'?Feb. 28, 1939. A. G MORRIS ET Al.

DIAPHRAGM PUMP 4. Sheets-Sheet 3 Filed June 28, 1937 A. G4 MORRISl -r'AL' 2,148,957

Feb. 2s', 193'9.

DIAPHRAGM PUMP Flvd June 28, 1937 4 Sheets-Sheet 4 Patented Feb. 28,1939` PATENT oFFic-:E

DIAPHRAGM PUMP lAlan Gordon Morris and Thomas Cooper Bim,

London, England Application June 28, 1937, Serial No. 150,81Q

In Great Britain July l, 1938 3 Claims.

and has for its object the provision of a compact pump of the above typefor dealing with all classes of uids which has high efliciency, has nostuffing box, is positively self-priming and can be run at very lowcost; will give long service Without repair and When replacements arerequired these may be made inexpensively and with facility; and issilent in its operation.

l0 A further aim of the invention is to provide a pump capable ofdealing with liquids containing abrasive matter or grlt in suspension,such as l found in sump Water' and most springs and well waters.

The invention consists in a pump unit comprising a casting embodying,preferably integrally, inlet and discharge passages opening throughrubber valves mounted in a partition of the casting into a pump chamberin or over which is u seated a stout rubber diaphragm actuated by acrank or eccentric drive. Y

lt is preferred to'mount in the valve orifices rubber valves of knownkind having a slit or slits adapted normally to seal under the resili- 5ence of the rubber and uid pressure. The unitary casting to which may becoupled a bell or air chamber is mounted upon or housed in a casing orframe member which may be adapted to carry an electric motor for drivingthe pump.

Convenient embodiments of the invention are illustrated in theaccompanying drawings in which: v

Figure l illustrates in sectional view one form of pump unit accordingto the invention, the sec- 5 tion being taken on line l--l of Figure 2;

Figure 2 is a front elevation orthe unit shown in Figure i with theiront plate removed;

Figure 3 is a sectional plan view taken on line 3 3 of Figure l with thediaphragm removed;

'Egures 4 and 5 are views similar to Figures l and 2 of a modified formof pump unit, and

Figure 6 is a view drawn to a smaller scale of a pump unit including amotor and drive therefrom.

In carrying the invention into eect according to one convenient modeillustrated in Figures l, 2 and 3 of the drawings, an outer casing orframe l0, preferably inthe form of a box casting the upper portion ofwhich may be wedgeshaped, as indicated inFigure 2, where the drive shaftis introduced, is adapted to support on a pair of projecting flanges lla plate l2 cast in one with a unit embodying inlet and delivery L-shaped passages or branches I3 and I4 respectively arranged in the sameplane back to back,

(CI. 10S-156) This invention relates to diaphragm pumps,

the oriilces of which open into a partition l5 in the casting in whichrubber valves i6, Il are seated. Around and embracing the partition andvalve orifices is a circular wall i8 which forms a pump chamber i9closed by a rubber dia- 5 phragm 20 of cup form fitted on the outerperiphery of the Wall i8 and clamped in position by a metal band 2l. Thediaphragm is of stout form-havingl thick walls tapering outwardly.

In the centre of the diaphragm a hole 22 is 10 provided and recesses 23,24 are made respectively for the large head 25 of a clamping screw 26and a junction 2l to which the lower end of a connecting rod 28 ispivotally connected. The screw 25 is` secured to the junction 2l withthe 15 centre portionof the diaphragm clamped between the head 25 ofscrew iid and the junction. The upper or big end 23 of'the connectingrod is mounted on a'ball or roller bearing 3U carried by a crank pin itlof a crank shaft portion 20 32 sleeved over and secured to a drivingshaft 33 by pin 3d. The shaft d3 and the crank shaft portion 32 aremounted in bearings 35 and 36 in the tapered part of the casing lil.

As shown the delivery branch it has mounted 25 on it and incommunication therewith a bell or air chamber 3l. This chamber islocated within the outer casing t@ and is of substantially circular formin front view (Figure 2).

The rubber valves it, l's' are of known kind 30 and leach comprises astout rubber blocl; recessed at 352i on one side land of somewhatpyramidal form on the other, having a single or, as shown,

a tripartite slit 3S through the rubber which constitutes a resllientlyself-closing and sealing 3.. valve element under huid pressure. Eachvalve has a rubber flange 40 mounted on the seating around the valveoriiices and secured in position by a clamping bezel or ring di screwedinto the orifices.

The front of the casing lll is closed by a metal plate d2 secured to thecasing by set screws t3 or the like.

' A modified form of diaphragm and bell or air chamber is shown inFigures 4 and 5 in which 45 parts similar to those of the rst describedform have been given the same reference numerals.

'According to this modication the diaphragm i@ is of stout disc form theupper surface of which is dished or has a concave recess while the 50lower surface is provided with an annular groove 46, for reception ofthe upper portion or rim of the annular wall i8, and a circular recess41 for a clamping nut 48. An annular metallic disc 49 is located in therecess 45 of the diaphragm 55 and has a central threaded portion 50extending through a central opening 5I oi' thedlaphragm and upon whichthe clamping nut Il is secured to thus clamp the diaphragm between thedisc 49 and the nut. The disc I9 has an upstanding rib portion 52 towhich-the plate-like lower end 53 of the connecting rod 38 is secured bymeans of bolts 64.

V'I'he bell or air chamber according to the modied form -of theinvention consists of a tube 55 having its lower end screwed into a boss5B formed on the delivery branch Il, the tube extending angularlythrough the side of the upper part of the casing I0 and having a cap 51closing its upper end. i

As shown in Figure 6 of the drawings the pumpfunit may incorporate anelectric motor I8 mounted on the side o! the casing I0 with` operationif desired.

Itrwill readily be appreciated that in both forms of the invention thedrive between shaft 33 andthe connecting rod 28 may be an eccentric oneinstead ci the crank and crank pin arrangement shown.

'I'he operation of both forms of the invention will be readily apparent,the diaphragm being actuated by the crank or eccentric drive .wheneverthe drive shaft vis rotated to intermittently -draw uid through theinlet passage i3 and the inlet valve I6 into the pump chamber I9 anddischarge same through outlet valve Il and deliverypassage Il, thedelivery being rendered' ience of the rubber and the iiuid pressure havedistinct advantages over mushroom type valves in that they are openedand closed rapidly and with little effort. Thus Ahigher operating speedsof the pump are obtainable. Furthermore, it has been found that byutilizing therubber valves a 'volume of liquid even greater than thatcorresponding to the displacement oi the diaphragm is delivered perstroke due to the easy opening of the valves and the fact that as thediaphragm approaches the top of its stroke the inertia of the incomingliquid through the inlet valve it causes opening of'the outlet valve l1and thus delivery commences before the suction stroke of the diaphragmis completed.

In both forms of the invention the parts are of robust nature, thusgiving long service, and are readily disassembled so that replacement`of parts may be made with facility.

v Although the invention has been described with reference to a singlepumping unit it will be appreciated that the same principles may beemployed in connection with a pump comprising a plurality oi' unitsarranged to operate in series or parallel or in a group.

We claim:

1. A pump unit comprising in combination, a casting, a pump chamberembodied in said casting, a partition in the casting forming the lowerwall of the pump chamber, inlet and discharge passages formed inthecasting below said partition and opening through said partition into thepump chamber, a rubber inlet valve and a rubber outlet valve mounted insaid partition said valves respectively controlling communicationbetween the inlet and discharge passages and the pump chamber, a rubberdiaphragm of cup form mounted over the pump chamber, a clamping screwhaving a head, a junction member, said diaphragm having a thick walltapering outwardly and having its centre portion clamped between thehead of said clamping screw and said junction member, and a crank drivefor actuating said diaphragm including a connecting rod pivotallyconnected to said junction member.

2. A pump unit comprising in combination, a casting, a pump chamberformed by a circular wall of said casting,` a partition in the castingforming the lower wall of the pump chamber, 'an inlet passage and adischarge passage both formed in the casting below the partition andopening through the partition into the pump chamber, a rubber inletvalve and a rubber outlet valve both mounted in the partition andrespectively controlling communication between the inlet and dischargepassages and the pump chamber, a diaphragm in the form of a thick rubberdisc having an annular groove on one side in which the rim ofsaidannular wall `of the casting is received, means for clamping themarginal portion of the diaphragm to said annular wall, a concave recessin the other'side of said thick rubber disc, an annular metallic discylocated in said concave recess, said annular metallic disc having acentral threaded portion extending through the centre of the thickrubber disc,

a nut screwed on said threaded portion whereby the centre of thediaphragm is clamped between said annular metallic disc and said nut,and

metallic disc.

3. A pump unit comprising in combination, a casting, a pump chamberformed by a circular wall of the casting. a partition in the castingforming the lower wall ofthe pump chamber, inlet and discharge passagesformed in the casting below the said partition and opening through thepartition into the pump chamber, a rubber inlet valve and a rubberoutlet valve mounted in said partition, said valves respectivelycontrolling communication between the inlet and discharge passages andthe pump chamber; a rubber diaphragm of cup form tted over the outerperiphery oi the said circular wall of the casting: a clamping ringclamping the marginal portion c" the diaphragm to said circular wall,two int...- connected clamping elements between which the centre portionof the diaphragm is secured, and aA crank drive for actuatingsaiddiaphragm including a connecting rod secured to one of saidinterconnected clamping elements.

' ALAN GORDON MORRIS.

THOMAS COOPER RIGGS.

